The world's largest effigy is a mound located on a promontory in southern Ohio. The aerial photographs of the Great Serpent were taken in 1934 by Dache M. Reeves and are reproduced courtesy of the Smithsonian Institution. All other photographs are original. The printing process is photocopy with pochoir, color pencil and collage. The covers are unique, done with spray paint, stencils and grass.